Differentiate an interventional study from an observational study.

Differentiate an interventional study from an observational study.

• A. In­terventional studies focus on observing natural exposure without manipulation.
• B. Observational studies involve active assignment to an exposure.
• C. Interventional studies involve active assignment to an exposure or treatment; observational studies do not assign exposures.
• D. Observational studies always require blinding.

Answer: (C)